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Determine which of the following reactio...

Determine which of the following reactions taking place at constant pressure represents system that do work on the surrounding environment
`Ag^(+)(aq)+Cl^(-)(aq)rarrAgCl(s)" " (II) NH_(4)Cl(s)rarrNH_(3)(g)+HCl(g) " " (III) 2NH_(3)(g)rarrN_(2)(g)+3H_(2)(g)`

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